| Duncan to Redondela | 4,637.27 mi (7,462.97 km) |
| Duncan to Reinosa | 4,815.75 mi (7,750.20 km) |
| Duncan to Requena | 5,074.07 mi (8,165.92 km) |
| Duncan to Reus | 5,112.27 mi (8,227.40 km) |
| Duncan to Rianxo | 4,616.85 mi (7,430.10 km) |
| Duncan to Ribadeo | 4,669.51 mi (7,514.86 km) |
| Duncan to Rincon de la Victoria | 5,024.30 mi (8,085.83 km) |
| Duncan to Ripoll | 5,120.74 mi (8,241.03 km) |
| Duncan to Ripollet | 5,145.53 mi (8,280.92 km) |
| Duncan to Rojales | 5,142.13 mi (8,275.45 km) |
| Duncan to Ronda | 4,981.47 mi (8,016.90 km) |
| Duncan to Roquetas de Mar | 5,101.83 mi (8,210.60 km) |
| Duncan to Rosas | 5,160.75 mi (8,305.43 km) |
| Duncan to Rubi | 5,140.22 mi (8,272.38 km) |
| Duncan to Rute | 4,999.31 mi (8,045.60 km) |
